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This mock test of Test: Ohm’S Law for Class 12 helps you for every Class 12 entrance exam.
This contains 5 Multiple Choice Questions for Class 12 Test: Ohm’S Law (mcq) to study with solutions a complete question bank.
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QUESTION: 1

V-I graph of which material shows the straight line

Solution:

Materials which obeys the ohm’s law show straight line in the V-I graph. Since silver is the only ohmic material in given options, it shows straight line curve.

QUESTION: 2

The following fig. shows I-V graph for a given metallic wire at two temperatures T_{1}and T_{2}.Then,

Solution:

**The correct option is Option B.**

The slope of the graph = I / V

In case of T2, I/V is less. Hence, V/I (=R) is more.

Value of resistance increases with increasing temperature.

Hence, T2 >T

QUESTION: 3

How many electrons are flowing per second through a section of a conductor corresponding to current of 1A?

Solution:

I=Q/t

1 Ampere = 1 Coulomb /1 Secon

Charge on 1 electron = 1.6 x 10^-19

Coulomb

By unitary method,

If 1.6 x 10^-19 Coulomb / Second (Ampere) = Current by 1 electron

then, 1( Coulomb / Second) or (Ampere) = 1 / (1.6 x 10^-19) electrons

i.e, **6.25 x 10^18 electrons**.

QUESTION: 4

1 ohm is equal to

Solution:

1 Ohm is defined as the resistance of a conductor with a potential difference of 1 volt applied to the ends through which 1-ampere current flows.

Ohms is the SI unit of electrical resistance.

QUESTION: 5

Which of the following is an ohmic conductor?

Solution:

Ohmic conductors are those which follows ohm's Law

**Constantan is an copper nickle alloy which follows ohm's law **

An electrolyte is a chemical that produces an electrically conducting solution and hence conducts electrical current.

But Electrolyte can be Ohmic as well as non-ohmic conductor

Transistor is semi-conductor device and does not follow ohm's Law

thermionic valves - is vacuum tube (electronic tube) , uses ion emission.

So option C Constanton s an ohmic conductor.

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